Generate random number between a given sequence using rand and exisiting matrix

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Kash022 2016-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/304521-generate-random-number-between-a-given-sequence-using-rand-and-exisiting-matrix

评论： Kash022 2016-9-26

Hello,

Is there a way I can generate a random number vector of dimensions N*M*K between a given defined sequence? For example, I would like to generate a 256*2500*16 matrix and the elements of this matrix should be say between the values,8e-4 and 2.5e-8? I have tried to use the rand function with the 'like' option but don't see how to generate between that sequence.

my_needed_matrix = rand(size(my_existing_matrix),'like',my_existing_matrix);

Here my_existing_matrix is the matrix which from which I wish to create another matrix of similar values.

Thank you!

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Adam 2016-9-26

You haven't given any information as to how your existing matrix is supposed to contribute to the solution other than by giving its size which is rather trivial. Based on the information you have given Andrei's answer and your plot of it gives exactly what I would expect from your question.

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回答（1 个）

Andrei Bobrov 2016-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/304521-generate-random-number-between-a-given-sequence-using-rand-and-exisiting-matrix#answer_236111

编辑：Andrei Bobrov 2016-9-26

在 MATLAB Online 中打开

a = 2.5e-8;
b = 8e-4;
my_needed_matrix = rand(size(my_existing_matrix))*(b - a)+a;

Please read MATLAB Documentation about it.

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Kash022 2016-9-26

Its a huge mat file ~ 71MB. so I don't think its possible to attach it here. my_existing_matrix is a 256*2500*16 double

Kash022 2016-9-26

在 MATLAB Online 中打开

The trace exists between points 500 and ~650..so I tried to write this

out(t(:,500:650,:)) = rand(sum(t),1)*6e-5 + 1.5e-5;

but it still returns the previous error. So you see, between these two points I need something which rises upto say 575, and then decreases to zero for the other half.

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